Regenerative repeater for telegraph signals



Feb. 21, 1939. R SALMON 2,14YJ323 REGENERATIVE REPEATER FOR TELEGRAPH SIGNALS Filed July 11, 1955 Ouiyaz'ny Line Incoming Line Patented Feb. 21, 1939 2,147,823;

UNITED STATES PATENT OFFICE 2,147,823 REGENERA'HVE REPEATER For: TELEGRAPH SIGNALS Reginald Dennis Salmon, Croydon, England, as-

signor to Creed and Company Limited, Croydon, England Application July 11, 1935, serial No. 30,854 Iii Great Britain August 23', 1934 It) Claims. (Cl; 178 -70) This invention relates to regenerators for teleslot in a second bell crank lever. This slot is at graph signals, and its object is to provide an right angles to the first slot an'd this secondbell atrah'gehieat whereby the percentage of each crank lever is also actuated by a cam to give to signal element used to determine its character the striker pin a simple harmonic motion at 5 is reduced to a minimum, and whereby the exright angles to the first said motion but 90 out 5 trenre accuracy required for this purpose may be f phase therewith. The resultant motion is a achieved with the minimum amount of m'anucircular movement in a plane. The striker 'pfi'n facturing care. is also moved by the receiving magnet armature It is known in selector mechanism for type to and fro at right angles to this plane according 1o printing telegraph apparatus to cause an arm, to the character of the elements of the received released for rotation for each signal, to be moved si s. V aicia-llyin response to the successive elements of It is arranged to be moved upwards in the gap the signal and to cooperate with a seriesofselec between the ends of two latches at a moment tor members arranged in the circular path of correspo d o e middle of each Signal 1L3 movement of the arm, ment so thatits position in the direction of the This known mechanism was not intended as a axis of its circular movement determines which regenerator. Its use for regenerating signals for f the two latches shall be str c During t ire-transmission would be cumbersome, even if remainder of its circular movement the striker possible, and if the selector mechanism were to p n cn e y Cle Of e latches- 2'0 be used also as a regenerator, that is, accurately la e are carrifid by bell c'rtthli letters to pick out the middle of each signal element for which normally r'est a a st f stops d e that portion ohly to actuate the selector mornh d by Sp gs theiagainst. The free ends of hers, exceedingly accurate spacing of the selector fi l c ank lev s t d to b Pu d together members in the circular path'of'therotating arm y spiri g, t ev a prevented f om would be necessary and would be exceedingly vi y t fi Stops l h 25 difiicult to ensure. These free ends also act on a double armed lever This invention uses the same principle of a on a o k aft w may ry ta ts r rotating arm axially movable to actuate selecp e a c an deV Cehe movement of tively a device arranged in its circular path of e f t e a c es by t e, st i e pin ra its JO movement but by using this principle in a pure sp d e l a k v om the fiXed s op regencrator, leaving the selection to be performed d S0 a owst t leveitb move the rock shaft separately by the regenerated elements of the n one direction orthe other depending on the signal, extreme accuracy can be secured much particular latch actuated. The bell crank levers more easily, since the moment of regeneration is are reset immediately afterwards by means of a determined by a single point in the rotation of d m. 35 the arm. I In'the preferred embodiment of the invention According to one feature of the invention a simplerdevicfif s usg i giving Circular movetherefore a regenerator for telegraph signals hfit t0 the Str ker pin or arm, and this embodicomprises a rotatable member operable in axial merit will now be described with reference to the 4,0 direction by a magnet responsive to successive ihi y d aw Which ShOWS a pe p 40 elements of received signals and released for a tive View of the rge erator as app edtogie predetermined degree of rotation for each signal, geheratiiig t e Signals ,in a start stop telegraph the said arm cooperating with a single reproducsystem for the D'urpO'S 0t passing the a ing device adapted to be selectively actuated so re e rated Se tor echanism. I

thereby in accordance with its axial position. The armature of th rece v g a net arma- 45 Preferably the single reproducing device 'comture turns, in onedir'ectionor the other, a shaft pfises two members, one or other of which is zsuitably mounted. This shaft carries two arms struck by the rotatable member according to its 3 and 4. Fixed to the arm t is one end of a axial position when passing the said members. shaft 5, t e ,o e Of which s carried y a In one embodiment of the invention a striker arm 6 in such a manner as to be rotated there y 50 pin is carried by a bell crank lever caused to exebut to be freely movable in the direction of its onto a simple harmonic motion in one line by length. The arm 6 is carried on a shaft 1 romeans ofa cam. The striker'pin passesthrough tat'ed as hereinafter described. The arm 3 when a slot in an extension of the armature 'leverof in theposition shown holds a detent lever 8 in thereceiving electr'orhagnet and als'otht'ougha n act with a de ent: cam 10 on a'shaft I2 against a spring 9. The detent lever 8 is fixed to a rotatably mounted shaft II to which also is .fixed a resetting lever I3. The shaft I2 carries a resetting cam I4 and a further cam I5. The cam I5 acts on a detent lever, which is held by spring I! against a detent cam I8 on shaft 1.

The shaft I also carries a pair of cams I9, 20 adapted to act upon the arms 2|, 22 of a lever 23 pivoted on a pin 24. The lever 23 carries a pin 25 on which levers 26 and 21 are pivoted. One end of each of these levers carries a pin 28 or 29 working in a slot 30 or 3I in the end of a link 32 or 33. The other ends of links 32 and 33 are fixed to opposite ends of an arm 34 carrying a rod 35.

The lower ends of levers 26 and 21 abut against the ends of arms 36 and 31, pivoted on pins 38 and 39 and. held against levers 26 and 21 and against fixed stops (not shown) by springs 40 and M respectively.

The shaft 5 carries an arm 42 normally opposite the ends of arm 37. The shafts I and I2 are driven through friction clutches from an electric motor but are normally held stationary by the detents shown. The shaft I2 is arranged to execute one revolution in the time allotted to 6 signal elements, the shaft 1 to make half a revolution in the time of one signal element.

The operation of the regenerator is as follows:--On the response of the magnet to the start signal the shaft 2 is rotated clockwise and the arm 3 moved away from detent lever B. The latter is then withdrawn from the detent cam I by the spring 9 and the shaft I commences to rotate. The movement of detent lever 8 brings arm I3 against cam I4 which serves in well known manner to restore the detent lever in position to be retained by arm 3 during the stop period.

After the lapse of about 1% elements the end of the detent lever I6 comes on the high part of the cam I and is therefore raised against its spring I! from contact with cam I8. Shaft 'I thereupon commences to rotate. Shaft I carries round shaft 5 by means of arm 6 and thus arm 42 is rotated. The shaft 5 carrying arm 42 is moved axially according to the response of armature I to the elements of the received signal, so that arm 42 is positioned opposite arm 36 or arm 31 according to the nature of each element. Arm 42 therefore strikes one of these arms for each signal element and this is arranged to take place at the middle of the signal element. At the moment of striking or immediately thereafter the arm 23, reciprocated by cams I9 and 20 is moved to the left in the drawing so that levers 26 and 21 are also moved to the left. The lower ends of these levers are brought against the ends of arms 36 and 31. Suppose arm 31 has been struck by arm 42, it will have been moved into the position shown in the drawing, and the lower end of lever 21 will move over the end thereof. The lower end of lever 26 will strike against the end of the arm 36 that has not been moved. The lever 26 will therefore pivot on pin 25 and its upper end will move to the left. By means of link 32 arm 34 and rod 35 carried thereby will be turned clockwise.

When arm 22 is moved back again it will carry pin 25 and thus levers 26 and 21 but the pins 28 and 29 on these levers move in the slots in links 32 and 33 so as to leave arm 34 in the position into which it has been moved. Lever 21 is however carried clear of arm 3'! which is restored by spring 4I. Thus the striking of arm 36 or arm 3'! by arm 42 according to its axial position turns arm 34 in one or the other direction.

After a period of five signal elements, that is 2 revolutions of shaft 1, the end of arm I6 enters the hollow in cam I5 and. spring I! draws the arm into position to engage with cam I8 whereupon shaft is arrested.

The movements of arm 34 reproduce with greater force the movements of the armature I of the receiving magnet and are used to control the selector mechanism of the teleprinter. In the case in which the regenerator is used with a receiving teleprinter it is only necessary to regenerate the five elements of the signal proper but the arm 34 or the rod 35 carried thereby could be equipped with a contact tongue for retransmitting the signals. In that case the retransmission of the start and the stop signal would be controlled directly from shaft I2.

What is claimed is:

1. In a regenerator for telegraph signals, a magnet, a rotatable member operable in axial direction by said magnet responsive to successive elements of received signals and released for a predetermined degree of rotation for each signal, a single reproducing device, means on said member repeatedly to cooperate during the regeneration of one telegraph code combination with said single reproducing device, and means on said reproducing device repeatedly selectively actuated in the regeneration of one code combination in accordance with the successive axial positions of said rotatable member.

2. In a regenerator as claimed in claim 1 for a start-stop telegraph system, a shaft released for rotation after the start signal for the period of five signal elements only, and a slidable mounting for said rotatable member in said shaft.

3. A regenerator as claimed in claim lin which the said reproducing device comprises two arms one or other of which is adapted to be struck by the rotatable member according to its axial position.

4. In a regenerator for telegraph signals, a rotatable member, means for releasing said member for rotation around its own axis for each code combination and for axially moving it in accordance with the character of successive elements of each signal, a pair of arms arranged in the respective paths of movement of said member, and striker means for said member to strike one or the other of said arms repeatedly in the regeneration of one code combination.

5. A regenerator as claimed in claim 4 in which said striker means comprises a pair of levers, means for periodically moving said levers to feel for the positions of the ends of said arms, a reproducing member linked to the arms, and means to move the reproducing member in one or the other direction according to the positions of said arms.

6. A regenerator as claimed in claim 4 and in which said striker means comprises a pair of levers, a third lever pivotally connected with said pair of levers, and cams on said rotatable member cooperating with the ends of said arms.

7. A regenerator according to claim 1 and in which one axial position of said member corresponds to the marking and another axial position corresponds to the spacing element of the received signal, said means on the reproducing device being operated whenever said member is in the axial position corresponding to marking.

8. A regenerator for that type of telegraph signal in which each signal includes control pulses for synchronizing purposes and marking or spacing intelligence pulses characteristic of the signal proper, which comprises an actuating member rotatable about its own axis, and axially displaceable along said same axis, means for rotating said actuating member through a predetermined angular distance in response to the reception of a control element of a signal, means for positioning said member in a first or second axial position in accordance with the marking or spacing nature of the characteristic elements of the received signal, a pair of actuable members, one or the other of which is adapted to be actuated by said actuating member once for each characteristic element of a received signal.

9. A regenerator for signals of the type wherein a number of elements of varying character are included in each signal proper, comprising a single device having a pair of actuable members selectively operable into two different positions, a rotatable member, means for actuating said member through a predetermined degree of rotation about an axis in response to the reception of a signal, means for positioning said member in a given axial position in response to the reception of a signal element of given character, the' said member being adapted when it is in said given axial position to strike one of said actuable members of said device once for each element of the signal proper.

10. A regenerator as claimed in claim 9 for regenerating signals containing only five elements in each signal proper, wherein the said predetermined degree of rotation is more than one revolution.

REGINALD DENNIS SALMON. 

